feature (utils): implemented function to check if a char is a special character

inc/utils/string.h

@@ -52,6 +52,7 @@ void        string_bool_to_alpha            (string_t string, bool value);
 
 bool        string_is_char_text             (char chr);
 bool        string_is_char_number           (char chr);
+bool        string_is_char_special          (char chr);
 bool        string_is_char_alpha            (char chr);
 bool        string_is_char_uppercase        (char chr);
 bool        string_is_char_lowercase        (char chr);

src/utils/string.c

@@ -433,6 +433,16 @@ bool string_is_char_number(char chr) {
     return false;
 }
 
+bool string_is_char_special(char chr) {
+    if ((chr >= '!' && chr <= '/') ||
+        (chr >= ':' && chr <= '@') ||
+        (chr >= '^' && chr <= '`') ||
+        (chr >= '{' && chr <= '~')) {
+        return true;
+    }
+    return false;
+}
+
 bool string_is_char_alpha(char chr) {
     if (string_is_char_uppercase(chr) || string_is_char_lowercase(chr) || string_is_char_number(chr)) {
         return true;